1261136146 has 8 divisors (see below), whose sum is σ = 1893988620. Its totient is φ = 629806608.

The previous prime is 1261136119. The next prime is 1261136159. The reversal of 1261136146 is 6416311621.

It can be written as a sum of positive squares in 2 ways, for example, as 1116294921 + 144841225 = 33411^2 + 12035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378661 + ... + 381976.

Almost surely, 2^1261136146 is an apocalyptic number.

1261136146 is a deficient number, since it is larger than the sum of its proper divisors (632852474).

1261136146 is an equidigital number, since it uses as much as digits as its factorization.

1261136146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761468.

The product of its digits is 5184, while the sum is 31.

The square root of 1261136146 is about 35512.4787363541. The cubic root of 1261136146 is about 1080.4068386075.

Adding to 1261136146 its reverse (6416311621), we get a palindrome (7677447767).

The spelling of 1261136146 in words is "one billion, two hundred sixty-one million, one hundred thirty-six thousand, one hundred forty-six".